HydroKleen's advanced catch basin filter is designed to capture multiple pollutants. This BMP (Best Management Practice) removes hydrocarbons, sediments and other organics from storm water and industrial runoff.HydroKleen's patented filtration system has a mix of filters available to remove chemicals, odor, phosphorus and heavy metals from water flow. Units are available for round or square catch basin grates. HydroKleen also has media filter bags that can capture multiple pollutants. HydroKleen products provide overflow protection to help eliminate flooding. They are also verified by the EPA's ETV (Environmental Technology Verification) program. A discount is available for purchases of ten or more items.